2-NEUTRON-HOLE CONFIGURATIONS IN PB206 FROM ISOBARIC ANALOG MEASUREMENTS

Two-neutron-hole configurations involving p12, f52, and p32 neutrons are obtained for low-lying states of Pb206 from proton elastic and inelastic scattering from the isobaric analog states (IAS) of Pb207. Excitation functions for inelastic scattering to four of the final states have very little off-resonance cross section and resonate at only one or two of the Bi207 analog resonances, which is characteristic of the simple two-neutron-hole structure of the states. Experimental widths for decay from the IAS of the Pb208 ground state to the first three hole states of Pb207 are used to obtain the model widths needed to analyze the data. The two-neutron-hole configurations obtained for the Pb206 wave functions compare very well with the recent shell-model calculations of True. © 1968 The American Physical Society.